On the linear and integral models for metastable zone width determined by solution cooling method
Artykuł w czasopiśmie
MNiSW
70
Lista 2021
| Status: | |
| Autorzy: | Sangwal Keshra |
| Dyscypliny: | |
| Aby zobaczyć szczegóły należy się zalogować. | |
| Rok wydania: | 2021 |
| Wersja dokumentu: | Drukowana | Elektroniczna |
| Język: | angielski |
| Wolumen/Tom: | 576 |
| Numer artykułu: | 126377 |
| Strony: | 1 - 15 |
| Web of Science® Times Cited: | 7 |
| Scopus® Cytowania: | 7 |
| Bazy: | Web of Science | Scopus |
| Efekt badań statutowych | NIE |
| Materiał konferencyjny: | NIE |
| Publikacja OA: | NIE |
| Abstrakty: | angielski |
| From a consideration of fundamental concepts of metastable zone width (MSZW), as determined by the maximum undercooling ΔTm that a solution saturated at temperature T0 can withstand without crystallization as a function of cooling rate RL, final equations of three deterministic approaches, namely: solute-supply, integral nucleation and integral nucleation-plus-growth models, based on classical three-dimensional nucleation theory are derived in a consistent manner, and then used to analyze the published experimental data of ΔTm of glycine–water, glutaric acid–acetic acid and potassium tetraborate tetrahydrate–water systems saturated at different temperatures T0. From analysis of the experimental data of MSZW of glycine–water system trends of variations in the values of the nucleation kinetic parameters of the equation of the classical nucleation theory, obtained by the determininstic integral nucleation model and the conventional stochastic theory, are compared and discussed. It was found that: (1) equation of the simple solute-supply approach satisfactorily explains the dependence of ΔTm of solutions on cooling rate RL at their different saturation temperature T0, and enables to estimate nucleation parameters such as preexponential factor A and solid–solution interfacial solution γeff associated with nucleation, and (2) the values of γeff obtained from the MSZW data are relatively low and suggest the occurrence of crystallization by heterogeneous nucleation. Finally, the nature of nucleation encountered in MSZW measurements by the polythermal method is discussed |
